Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a display screen or portion thereof withtransitional graphical user interface showing a first image in a firstsequence according to the claimed design; and,

FIG. 2 is a front view showing a second image thereof; and,

FIG. 3 is a front view showing a third image thereof.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-3. The process or period in whichone image transitions to another image forms no part of the claimeddesign.

The longer outer-most broken lines showing an electronic deviceillustrate environmental subject matter. The regular broken linesshowing a display screen and elements of the graphical user interfaceillustrate portions of the article. None of the aforementioned brokenline subject matter forms part of the claimed design.

The heavy broken lines shown as rows of horizontal rectangles form nopart of the claimed design. The narrow double lines, including a brokenline segment at the left end of the lower line, do form part of theclaimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.